In a large pot, melt the butter over medium heat. Add the diced onion and garlic, sautéing until the onion is translucent, about 3-4 minutes.
Add the carrots, celery, and red bell pepper to the pot. Cook for another 5 minutes, stirring occasionally.
Stir in the zucchini, corn, vegetable broth, diced potatoes, thyme, oregano, salt, and pepper. Bring the mixture to a boil, then reduce the heat and let it simmer for about 15-20 minutes, or until the potatoes are tender.
Once the potatoes are cooked, stir in the heavy cream and shredded cheddar cheese. Continue to cook on low heat, stirring until the cheese is melted and the chowder is creamy.
Taste and adjust seasoning if necessary. Serve hot, garnished with fresh parsley.